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Tcl - Programming language

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Tcl, aka Tool Command Language, is a programming language created in 1988 by John Ousterhout.

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Tcl (pronounced "tickle" or tee cee ell, ) is a high-level, general-purpose, interpreted, dynamic programming language. It was designed with the goal of being very simple but powerful. Tcl casts everything into the mold of a command, even programming constructs like variable assignment and procedure definition. Read more on Wikipedia...

Example from Riju:
puts {Hello, world!}
Example from hello-world:
puts "Hello World"
#!/usr/local/bin/tclsh # Hello World in Tcl puts "Hello World!"
Example from Linguist:
# XDG Base Directory Specification handling # # Copyright (C) 2013 Lawrence Woodman # # Licensed under an MIT licence. Please see for details. # # For XDG Base Directory Specification # # package require Tcl 8.5 namespace eval XDG { variable DEFAULTS "" namespace export DATA_HOME CONFIG_HOME CACHE_HOME namespace export RUNTIME_DIR DATA_DIRS CONFIG_DIRS } proc XDG::SetDefaults {} { variable DEFAULTS if {$DEFAULTS ne ""} return set DEFAULTS [list \ DATA_HOME [file join $::env(HOME) .local share] \ CONFIG_HOME [file join $::env(HOME) .config] \ CACHE_HOME [file join $::env(HOME) .cache] \ DATA_DIRS [list [file join /usr local share] [file join /usr share]] \ CONFIG_DIRS [list [file join /etc xdg ]] ] } proc XDG::XDGVarSet {var} { expr {[info exists ::env(XDG_$var)] && $::env(XDG_$var) ne ""} } proc XDG::Dir {var {subdir ""} } { variable DEFAULTS SetDefaults set dir [dict get $DEFAULTS $var] if {[XDGVarSet $var]} { set dir $::env(XDG_$var) } return [file join $dir $subdir] } proc XDG::Dirs {var {subdir ""} } { variable DEFAULTS SetDefaults set rawDirs [dict get $DEFAULTS $var] if {[XDGVarSet $var]} { set rawDirs [split $::env(XDG_$var) ":"] } set outDirs {} foreach dir $rawDirs { lappend outDirs [file join $dir $subdir] } return $outDirs } # The remaining procs reference the environmental variables XDG_ # followed by the proc name. proc XDG::DATA_HOME {{subdir ""}} {Dir DATA_HOME $subdir} proc XDG::CONFIG_HOME {{subdir ""}} {Dir CONFIG_HOME $subdir} proc XDG::CACHE_HOME {{subdir ""}} {Dir CACHE_HOME $subdir} proc XDG::RUNTIME_DIR {{subdir ""}} { if {![XDGVarSet RUNTIME_DIR]} { return {} } return [file join $::env(XDG_RUNTIME_DIR) $subdir] } # The following procs returning the directories as a list with the most # important first. proc XDG::DATA_DIRS {{subdir ""}} {Dirs DATA_DIRS $subdir} proc XDG::CONFIG_DIRS {{subdir ""}} {Dirs CONFIG_DIRS $subdir}
Example from Wikipedia:
oo::class create fruit { method eat {} { puts "yummy!" } } oo::class create banana { superclass fruit constructor {} { my variable peeled set peeled 0 } method peel {} { my variable peeled set peeled 1 puts "skin now off" } method edible? {} { my variable peeled return $peeled } method eat {} { if {![my edible?]} { my peel } next } } set b [banana new] $b eat → prints "skin now off" and "yummy!" fruit destroy $b eat → error "unknown command"

Language features

Feature Supported Token Example
Strings "
"Hello world"
Print() Debugging puts
Line Comments #
# A comment
Case Insensitive Identifiers X
Semantic Indentation X
MultiLine Comments X

Books about Tcl on goodreads

title author year reviews ratings rating
Practical Programming in TCL & TK Brent B. Welch 1961 2 55 3.87
Effective Tcl/TK Programming: Writing Better Programs with TCL and TK Mark Harrison 1997 0 4 3.50
Tcl/TK Pocket Reference: Programming Tools Paul Raines 1998 0 9 3.22
TCL/TK Programmer's Reference Chris Nelson 1999 1 1 5.00
Tcl/Tk 8.5 Programming Cookbook Bert Wheeler 2011 0 1 3.00
Tcl/TK Programming for the Absolute Beginner Kurt Wall 2007 1 1 4.00
TCL 8.5 Network Programming Wojciech Kocjan 2010 1 3 3.67
Tcl/TK: A Developer's Guide Clif Flynt 2003 0 0 0.0
TCL/TK for Dummies? Tim Webster 1997 0 2 3.50
CGI Programming with TCL [With CDROM] David Maggiano 1999 0 0 0.0

Books about Tcl from ISBNdb

title authors year publisher
Effective Tcl/TK Programming: Writing Better Programs with TCL and TK Harrison, Mark and McLennan, Michael 1997 Addison-Wesley Professional
Tcl and the Tk Toolkit Ousterhout, John and Jones, Ken 2009 Addison-Wesley Professional
Tcl 8.5 Network Programming (Community Experience Distilled) Kocjan, Wojciech and Beltowski, Piotr 2010 Packt Publishing
Cgi Developer's Resource: Web Programming in Tcl and Perl (Resource Series) Ivler, J. M. and Husain, Kamran 1997 Prentice Hall Ptr
Web TCL Complete Stephen Ball 1999 McGraw-Hill Inc.,US
Practical Programming in Tcl and Tk Welch, Brent and Jones, Ken 2003 Pearson
The Tcl Programming Language: A Comprehensive Guide Nadkarni, Ashok P. 2017 CreateSpace Independent Publishing Platform
Practical Programming in Tcl & Tk Welch, Brent B. 1997 Prentice Hall
TCL / TK in a Nutshell: A Desktop Quick Reference Raines, Paul and Tranter, Jeff 1999 O'Reilly Media
Tcl and Tk Programming for the Absolute Beginner Wall, Kurt 2007 Cengage Learning PTR
Tcl and the Tk Toolkit Ousterhout, John K. 1994 Addison-Wesley Professional
Practical Programming in Tcl and Tk (3rd Edition) Welch, Brent B. 1999 Prentice Hall
Practical Programming in Tcl and Tk/Book and Disk Welch, Brent B. 1995-04T Prentice Hall
Cgi Programming With Tcl David Maggiano 1999 Addison-wesley
Tcl 8.5 Network Programming Wojciech Kocjan; Piotr Beltowski 20100701 Packt Publishing
Tcl And The Tk Toolkit Ousterhout, John K. 1994 Addison-wesley

Publications about Tcl from Semantic Scholar

title authors year citations influentialCitations
VIPERS: a data flow visual programming environment based on the Tcl language Massimo Bernini and M. Mosconi 1994 21 3
Petascale Tcl with NAMD, VMD, and Swift/T James C. Phillips and J. Stone and Kirby L. Vandivort and Timothy G. Armstrong and J. Wozniak and M. Wilde and K. Schulten 2014 18 0
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